无人机翼伞回收系统刚柔耦合动力学建模方法

利用可控翼伞实现固定翼无人机的精确回收具有十分广阔的应用前景。然而,由于无人机与翼伞之间的相对运动,柔性伞绳随时发生变化,导致现有基于刚性假设的动力学模型不能准确地反映无人机与翼伞之间的约束关系。为了解决这个问题,文章提出了一种基于柔性伞绳的翼伞-无人机系统多体动力学建模方法:假设翼伞和无人机之间由多根抗拉不抗压的弹性绳单元连接,建立相应的柔性伞绳动力学模型;再结合翼伞和无人机的运动方程,推导出翼伞-无人机系统的刚柔耦合动力学模型。通过与8自由度模型的对比发现,当控制输入较大时这种耦合模型更能反映翼伞-无人机系统的运动情况。

随机初值条件下基于翼伞的无人机回收方法

翼伞回收系统由柔性伞衣和所回收负载组成,存在对着陆场要求低、飞行安全稳定、可雀降无损着陆等独特优势,在无人机回收、物资空投等军用及航空航天领域都发挥着不可替代的重要作用。翼伞回收系统依靠柔性伞衣提供升力,但伞衣存在复杂的非线性动力学特性,导致其控制难度较传统刚性飞行器更高。针对该问题,基于部分假设,通过对柔性伞衣和系统负载间的相互作用进行动力学分析,建立翼伞回收系统的简化动力学模型。基于自抗扰控制技术设计水平控制器与归航策略,实现随机初值条件下的翼伞高精度归航,从任意初始位置及角度将无人机精确地运输至目标位置。飞行测试结果表明:所建立的动力学模型可为翼伞的实际飞行实验提供仿真调试环境,实现控制器参数调节;在15次翼伞归航控制实验中,翼伞系统的平均归航落点误差为21.9 m。

舰载固定翼无人机起降方式探寻

本文通过比较多种固定翼无人机发射和回收方式，综合考虑舰载无人机的使用环境特点，对利用火箭助推发射和翼伞回收的方式做为舰载固定翼无人机的起降方式进行了综述.

Design and simulation for large parafoil fix line object homing algorithm

Traditional parafoil homing usually uses a point as object. As the mobility of parafoil is limited by its glide ratio and wind, in some cases when the parafoil scatter area is large, or the glide ratio of parafoil is small, the deviation of its landing point to object point will be arduous to control. Accordingly, during these situations, when parafoil is used in recovery of spacecraft or satellite, the landing area of parafoil can be set as a rectangle, and the object of parafoil can be set as a line segment. The thesis of this work is designing an algorithm for parafoil homing using line segment as object. The algorithm of wind velocity and direction calculation in different flying segments was also investigated. The algorithm designed navigates the parafoil to land into the predestined area and largely reduce the probability of recovery loads falling to unwanted area to damage houses and people.